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Evaluation of Flame Area Based on Detailed Chemistry DNS of Premixed Turbulent Hydrogen-Air Flames in Different Regimes of Combustion

Klein, M. and Herbert, A. and Kosaka, H. and Böhm, B. and Dreizler, A. and Chakraborty, N. and Papapostolou, V. and Im, H. G. and Hasslberger, J. (2019):
Evaluation of Flame Area Based on Detailed Chemistry DNS of Premixed Turbulent Hydrogen-Air Flames in Different Regimes of Combustion.
In: Flow, Turbulence and Combustion, Springer Science+Business Media B.V., pp. 1-17, ISSN 1573-1987,
DOI: 10.1007/s10494-019-00068-2,
[Online-Edition: https://doi.org/10.1007/s10494-019-00068-2],
[Article]

Abstract

Precise evaluation of flame surface area plays a pivotal role in the fundamental understanding and accurate modelling of turbulent premixed flames. This necessity is reflected in the requirement for the instantaneous flame area evaluation of the turbulent burning velocity (by making use of Damköhler's first hypothesis). Moreover, the information regarding flame area is required in the context of flame surface density based modelling, and for determining the wrinkling factor or estimating the efficiency function. Usually flame surface areas in experiments and Direct Numerical Simulation (DNS) analyses are evaluated differently and the present analysis aims at comparing these approaches by making use of a detailed chemistry DNS database of turbulent, statistically planar flames. It has been found that the flame surface area evaluation is sensitive to the choice of scalar quantity and the isosurface level, and this holds particularly true for two-dimensional evaluations. The conditions, which provide a satisfactory agreement between experimental and numerical approaches in the flame area evaluation, have been identified by a detailed comparative analysis of the usual postprocessing techniques.

Item Type: Article
Erschienen: 2019
Creators: Klein, M. and Herbert, A. and Kosaka, H. and Böhm, B. and Dreizler, A. and Chakraborty, N. and Papapostolou, V. and Im, H. G. and Hasslberger, J.
Title: Evaluation of Flame Area Based on Detailed Chemistry DNS of Premixed Turbulent Hydrogen-Air Flames in Different Regimes of Combustion
Language: English
Abstract:

Precise evaluation of flame surface area plays a pivotal role in the fundamental understanding and accurate modelling of turbulent premixed flames. This necessity is reflected in the requirement for the instantaneous flame area evaluation of the turbulent burning velocity (by making use of Damköhler's first hypothesis). Moreover, the information regarding flame area is required in the context of flame surface density based modelling, and for determining the wrinkling factor or estimating the efficiency function. Usually flame surface areas in experiments and Direct Numerical Simulation (DNS) analyses are evaluated differently and the present analysis aims at comparing these approaches by making use of a detailed chemistry DNS database of turbulent, statistically planar flames. It has been found that the flame surface area evaluation is sensitive to the choice of scalar quantity and the isosurface level, and this holds particularly true for two-dimensional evaluations. The conditions, which provide a satisfactory agreement between experimental and numerical approaches in the flame area evaluation, have been identified by a detailed comparative analysis of the usual postprocessing techniques.

Journal or Publication Title: Flow, Turbulence and Combustion
Publisher: Springer Science+Business Media B.V.
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Reactive Flows and Diagnostics (RSM)
Date Deposited: 07 Oct 2019 07:36
DOI: 10.1007/s10494-019-00068-2
Official URL: https://doi.org/10.1007/s10494-019-00068-2
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